Storing images locally on an iOS device

Question

Some iOS photo-related apps store images created with the app somewhere other than the photo library. For example Fat Booth shows a scrolling list of photos created with the

Answer 1

The simplest way is to save it in the app's Documents directory and save the path with NSUserDefaults like so:

NSData *imageData = UIImagePNGRepresentation(newImage);

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];

NSString *imagePath =[documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.png",@"cached"]];

NSLog(@"pre writing to file");
if (![imageData writeToFile:imagePath atomically:NO]) 
{
    NSLog(@"Failed to cache image data to disk");
}
else
{
    NSLog(@"the cachedImagedPath is %@",imagePath); 
}

Then save the imagePath in some dictionary in NSUserDefaults or however you'd like, and then to retrieve it just do:

 NSString *theImagePath = [yourDictionary objectForKey:@"cachedImagePath"];
 UIImage *customImage = [UIImage imageWithContentsOfFile:theImagePath];